Theoretical Overview of the Pentaquark Baryons

Abstract

A review is given of the theoretical ideas concerning the mysterious pentaquark baryons proposed during the first year after its discovery. We focus on the difficulties involved with the constituent quark models and the discrepancy between the QCD predictions and most of the phenomenological models.

Review based on the talk given at the YITP Workshop on ``Multi-quark Hadrons; Four, Five and More?'', held on Feb. 17-19, 2004. To be published in Progress of Theoretical Physics as an invited paper

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• New Hadron States
• First Study for the Pentaquark Potential in SU(3) Lattice QCD
• Five-body calculation of resonance and scattering states of pentaquark system
• Penta-quark baryon in anisotropic lattice QCD
• Search for the possible S=+1 Pentaquark states in Quenched Lattice QCD
• Spin 3/2 Penta-quarks in anisotropic lattice QCD
• Decay of Theta+ in a quark model
• Pentaquark Decay Width in QCD Sum Rules
• Light-Front Approach for Pentaquark Strong Decays
• Pentaquark state in pole-dominated QCD sum rules
• Axial vector tetraquark with S=+2
• Pentaquark as a NK^* bound state with TJ^P=0{3/2}^-
• Phenomenology of spin 3/2 baryons with pentaquarks
• Comparative Regge analysis of $\Lambda ,{\Sigma }^0,\Lambda (1520)$ and ${\Theta }^{+}$ production in $\gamma p$, $\pi p$ and $pp$ reactions
• Magnetic moment of the pentaquark ${\Theta }^{+}(1540)$ as diquark-diquark-antiquark state with QCD sum rules
• Ground state mass spectrum for scalar diquarks with Bethe-Salpeter equation
• The "Closed" Chiral Symmetry and Its Application to Tetraquark
• Decay width of the pentaquark state ${\Theta }^{+}(1540)$ with QCD sum rules
• Photoproduction and Radiative Decay of Spin 1/2 and 3/2 Pentaquarks
• Chiral Structure of Scalar and Pseudoscalar Mesons
• Penta-quark in Anisotropic Lattice QCD
• Systematic study of pentaquark states: $qqq-q\bar{q}$ configuration
• Tetraquark and Pentaquark Systems in Lattice QCD
• Faddeev calculation of pentaquark ${\Theta }^{+}$ in the Nambu-Jona-Lasinio model-based diquark picture
• Structure and decay width of Θ^+ in a one-gluon exchange model
• Dynamics of Multiquark Systems: Mass, Width and Exotics
• Reanalysis the pentaquark ${\Theta }^{+}(1540)$ in the framework of QCD sum rules approach with direct instantons
• Stability of the rotating SU(3) Skyrmion
• Chiral Soliton Model vs Pentaquark Structure for Θ(1540)
• Exotic hadrons from dynamical clustering of quarks in ultrarelativistic heavy ion collisions
• Penta-Quark Anti-Decuplet in Anisotropic Lattice QCD